It snowed -- once again -- across the D.C. area Thursday morning, prompting several school systems to close or open late Thursday.

Snow was heaviest during the early-morning commute, and will taper off and end around noon. Road conditions are slippery on untreated pavement; sidewalks and any untreated surfaces are going to stay slick because the region will stay below freezing for the rest of the day, Storm Team 4 Meteorologist Tom Kierein said.